William a



Patented luly 5, |898.

W. A. KEMP.

./JJW d EMMA NIMH (No Model.)

No. 608,785. latermmluly 5, |898. w. A. KEMP.

PIPE ELBW vBENDINI? MACHINE.

(Applicac'ion med sept. 28,1891) No M odel.) 2 Sheets-Sheet 2,.

. Tn: Mums 51ans co 10N. n. c.

UNITED ASTATES PATENT Eric..

w-ILLIAM A. KEMP, OF TORONTO, CANADA.

PIPE-ELBOW-BENDING MACHINE.

SPECIFICATION forming part of Letters Patent No. 606,785, dated July 5,1898. Application filed September 23, 1.897. Serial No. 652,735. (Nomodel.)

To @ZZ whom it may concern:

Be it known that I, WILLIAM A. KEMP, a subject of the Queen of GreatBritain, residing at Toronto, -in the county of York, in the Province ofOntario, Dominion of Canada,

have invented a new and vuseful Improvegations extend circumferentiallyaround the The corrugation's are then compressed` pipe. uniformly, andthe pipe is finally bent int-o an elbow, whereby those portions of thecorrugations which lie on the outer side of the elbow are stretched ordistended, while the portions of the corrugations on the inner side ofthe elbow remain compressed.

The object of this invention is to provide a simple and eflicientmachine whereby the operation of bending a pipe into an elbow may beeffected easily andquickly.

, In the accompanying drawings, consisting of two sheets, Figure 1 is avertical longitudinal section of my improved pipe-bending machine. Figs.2 and 3 are vertical transverse sections in lines 2 2 and 3 3, Fig. 1,respectively. Fig. 4 is a horizontal section in line 4 4E, Fig. 1. j

Like letters of reference refer to like parts in the several figures.

A represents the horizontal bed or table ofA the machine, which isprovided with supporting-legs a.

B B' and B2 B3 represent two pairs of segmental clamping-jawswher'ebythe lower end of the corrugated pipe isheld'during the operation ofbending the same into an elbow.

These two pairs of jaws grasp diametrically opposite sides of the pipe,and each pair consists of a stationary jaw which is secured to the topof the table and a movable jaw which is movable horizontally toward andfrom the stationaryjaw.' One of the jaws of each pair has a convex facewhich bearsagainst the inner side of the4 pipe, and the other jaw of thesame pair has a concave face which bears against the outer side of thepipe. The stationary jaw B of one pair and the movable jaw B2 of theother pair bear against the inner diametrically Opposite sides of thepipe, and the movable jaw B and stationary jaw B3 of the correspondingpairs bear against the outer diametrically opposite sides of the pipe.

`The movable jaws are operated simultaneousl y by ahorizontally-reciprocating gearrackC, arranged below the table andprovided Withtwo lugs c c, which project upwardly through openings c' cin the table and of the machine.

bent toone side, so as to form the same into an elbow. The two pairs ofjaws grasp the pipe on diametrically Opposite sides, and each pairconsists of an inner jaw, having a convex face, which bears against theinner side of the pipe, and an outer jaw, having a concave face, whichbears against the outer side of the pipe. The outer jaw E of one pair isconnected by cross-bar F with the inner jaw E2 of the other pair, andthe inner jawE', cooperating with the outer jaw E, is connected by across-bar Gr with the outer jaw E3, cooperating with the inner jaw Thecross-bars are arranged to slide lengthwise, one upon the other, foropening or closing the two pairs of jaws. Preparatory to beginning thebending ofthe pipe the jaws are closed on the upper end of the pipe bymeans of a rotary cam H,which bears against the outer side of one of thecross-bars, and is pivotally connected by a-li'nlrh with the othercross-bar.

I represents a hand-lever whereby. the crossbars and theirclamping-jawsiare carriedand manipulated in bending the pipe. This leverIOC is pivoted to one of the cross-barsbya t-ransverse pin t' andprovided with a tooth or lug j, which engages with a notch or recess 2in the other cross-bar, whereby upon depressing this lever for bendingthe pipe the cross-bars are slid one upon the other in the direction forclosing the jaw and increasing the pressure of the same upon the pipe,thereby preventing the same from becoming detached from the pipe duringthe bending operation. The weight of the hand-lever and the upperclamping devices mounted thereon is balanced by a counterweight J, whichis connected with the hand-lever by a chain j, passing around anoverhead rollerj.

Ihile bending the pipe into an elbow its central portion tends toflatten into an oval shape by spreading outwardly at right angles to theplane in which the pipe is bent. In order to avoid this, two verticalretainingplatcs Ii K are arranged on opposite sides of the pipe parallelwith the line of movement of the upper clamping` devices. Theretaining-plates bear against opposite sides of the pipe and confine thelatter against spreading while the same is being bent into an elbow, andthereby prevent flattening of the central portion of the pipe. One ofthese plates is preferably secured rigidly to the table, while the otherplate slides in transverse guideways 7;/ on the table toward and fromthe other fixed plate, thereby permitting of conveniently inserting apipe between the plates and removing the same therefrom. The movableretaining-plate is moved inwardly toward the ixed retaining-plate by acam L, pivoted on the table and engaging with the movable plate, and ismoved outwardly by springs connecting the lnovablc plate with the table.

The operation of bending a corrugated pipe into an elbow is as follows:The straight pipe is iirst placed in a vertical position, as shown indotted lines, Fig. I, between the retainingplates and the open jaws ofthe lower clamping device. The jaws of the latter are then closed uponthe pipe, whereby the lower end of the pipe is iirmly secured inposition. The movable retaining-plate is then adj usted inwardly, sothat the pipe is confined snugly at its sides between theretaining-plates. The upper clamping device is now applied tothe upperend of the pipe, so as to seize the same iirmly and then swung laterallyand downwardly together with the upper portion of the pipe in a planeparallel with the retaining-plates, whereby the pipe is bent into anelbow. l'pon opening the clamps at both ends of the elbow andwithdrawing the movable retaining-plate the inished elbow may be easilyremoved. The downward movement of thc upper clamping device ispreferably limited by a stop consisting of a vertical screw-bolt m,engaging with the table. Ey screwing this bolt up or down the angle ofthe elbow may be varied.

I claim as my invention- I. In a machine for bending a pipe into anelbow, the combination with a stationary clamping device adapted tosecurely grasp one end of the pipe, and a movable clamping deviceadapted to grasp the opposite end ot' the pipe and to swing laterallywith reference to the other clamping device, of retainingplates adaptedto bear against the sides of the pipe and arranged parallel with theplane in which the movable clamping device swings, substantially as setforth.

2. In a machine for bending a pipe into an elbow,the combination withalaterally-swinging clamp adapted to grasp the free end of the pipe, ofastationary clamping device composed of two pairs of jaws, two of saidjaws being stationary and engaging one against the outer and the otheragainst the inner side of the pipe, and two of said jawsbei ng movableand engaging respectively against the inner side and. the outer sideoli' the pipe, substantially as set forth. y

3. In a machine for bending a pipe into an elbo\v,the combination with alaterally-swinging clamp adapted to grasp the free end of the pipe, of astationaryclamping device composed of two pairs of jaws, two of saidjaws being stationary and engaging one against the outer and the otheragainst the inner side of the pipe, and the other two ot' said jawsbeing movable and connected to move simultaneously in the samedirection, substantially as set forth.

t In a machine for bending a pipe into an elbow, the combination with alaterally-swinging clamping device adapted to grasp the upper end ot thepipe, of a stationaryclamping device composed of two pairs of jawsadapted to engage against opposite sides of the lower end of the pipe,each pair consisting of a fixed and a movable jaw, a gear-rackconnecting the movable jaws, and a gear-wheel meshing with thegear-rack, substantially as set forth.

In a machine for bending a pipe into an elbow, the combination with astationary clamping device adapted to grasp one end of the pipe, ot' alaterally-swinging clamping dcvice consisting of two pairs of jawsadapted to grasp opposite sides of the opposite end of the pipe, andbars connecting the inner jaw of each pair with the outer jaw of theother pair, substantially as set forth.

G. In a machine for bending a pipe into an elbow, the combination with astationary clamping device adapted to grasp one end of the pipe, oi' alaterally-swinging clamp consisting of two pairs of jaws adapted tograsp opposite sides ot the opposite end of the pipe, bars connectingthe inner jaw of each pair with the outer jaw of the other pair, and atightening-cam bearing against one bar and connected with the other bar,substantially as set forth.

7. In a machine for bending` a pipe into an elbow, the combination witha stationary clamping device adapted to grasp one end of the pipe, of alaterally-swinging clamping dcvice consisting of two pairs of jawsadapted IOO IIO

to grasp opposite sides of the opposite end of the pipe, bars connectingJ[he inner jaw of each pair With the outer jaw of the other pair, and alever pivoted on one of saidv bars and provided With a tooth engagingWith a notch in the other bar, substantially as set fort-h.

8. In a machine for bending a pipe into an elbow, the combination with astationary clamping device adapted to grasp one end of the pipe and alaterally-swinging clamping device adapted to grasp the opposite end ofthe pipe, of a stop which limits the lateral movement of the swingingclamping device,

- substantially as set forth.

9. In a machine for bending a pipe into an W'ILLIAM A. KEMP.

Witnesses:

W. FRANCIS, F. MGCARTHY.

